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    Magneto-optical recording/reproducing apparatus and method
    1.
    发明公开
    Magneto-optical recording/reproducing apparatus and method 审中-公开
    Gerätund Verfahren zur magneto-optischen Aufzeichnung / Wiedergabe

    公开(公告)号：EP0910077A2

    公开(公告)日：1999-04-21

    申请号：EP98119496.2

    申请日：1998-10-15

    申请人： HITACHI, LTD. ,  SONY CORPORATION ,  SHARP KABUSHIKI KAISHA ,  OLYMPUS OPTICAL CO., LTD. ,  SANYO ELECTRIC Co., Ltd. ,  FUJITSU LIMITED ,  HITACHI MAXELL, LTD.

    发明人： Tanaka, Yasuhito ,  Kurebayashi, Masaaki ,  Maeda, Takeshi ,  Watanabe, Hitoshi ,  Watanabe, Tetsu ,  Maeda, Shigemi ,  Sumi, Satoshi ,  Matsubayashi, Nobuhide ,  Matsuura, Michio

    IPC分类号： G11B11/10

    CPC分类号： G11B7/126 ,  G11B7/094 ,  G11B7/0941 ,  G11B7/0945 ,  G11B7/0956 ,  G11B11/10515 ,  G11B11/10576 ,  G11B11/10595

    摘要： A magneto-optical information recording/reproducing apparatus in which a magneto-optical information recording medium (1) at least including a first magnetic film having magneto-optical information recorded on a track and having perpendicular magnetic anisotropy, and a second magnetic film to which the magneto-optical information recorded on the first magnetic film is transferred by irradiation of a laser beam, is used so that a readout laser beam is irradiated onto the second magnetic film to thereby readout the magneto-optical information transferred to the second magnetic film. The apparatus includes a 2-split detection circuit (18) constituted by two detection elements (18a, 18b) for receiving the readout laser beam reflected from the second magnetic film of the magneto-optical information recording medium, and a subtraction circuit (19) in which output signals of the two detection elements of the 2-split detection circuit having levels corresponding to the quantities of light received by the two detection elements respectively are subtracted from each other to generate a differential signal expressing the difference between the output signals. The apparatus further comprises a circuit (22, 23) for making a spot of the laser beam jump one track before readout of the magneto-optical information from the magneto-optical information recording medium, a positive/negative balance correction circuit (20) for detecting an amplitude ratio between positive and negative side amplitudes in a track jump signal generated in the differential signal from the subtraction circuit in response to the track jump to thereby output a correction signal in accordance with the amplitude ratio, and an addition circuit (21) for adding the correction signal to the differential signal to thereby generate a tracking error signal for tracking control used in readout of the magneto-optical information from the magneto-optical information recording medium.

    摘要翻译： 一种磁光信息记录/再现装置，其中至少包括记录在轨道上并具有垂直磁各向异性的磁光信息的第一磁膜的磁光信息记录介质（1）和第二磁膜， 记录在第一磁性膜上的磁光信息通过激光束的照射被传送，使得读出的激光束照射到第二磁性膜上，从而读出传递到第二磁性膜的磁光信息。 该装置包括由用于接收从磁光信息记录介质的第二磁膜反射的读出激光束的两个检测元件（18a，18b）和减法电路（19）构成的二分割检测电路（18） 其中分离检测电路的两个检测元件的输出信号分别相应于由两个检测元件接收的光量的电平，以产生表示输出信号之间的差的差分信号。 该装置还包括一个电路（22,23），用于在从磁光信息记录介质读出磁光信息之前使激光束的点跳跃到一个磁道;正/负平衡校正电路（20），用于 检测来自所述减法电路的差分信号中产生的磁道跳转信号中的正负振幅之间的振幅比，以响应于所述磁道跳跃，从而根据所述振幅比输出校正信号，以及加法电路（21） 用于将校正信号添加到差分信号，从而生成用于跟踪来自磁光信息记录介质的磁光信息读出中使用的控制的跟踪误差信号。

    Magneto-optical recording/reproducing apparatus and method
    2.
    发明公开
    Magneto-optical recording/reproducing apparatus and method 审中-公开
    装置和方法的磁光记录/再现

    公开(公告)号：EP0910077A3

    公开(公告)日：2002-01-16

    申请号：EP98119496.2

    申请日：1998-10-15

    申请人： Hitachi, Ltd. ,  SONY CORPORATION ,  SHARP KABUSHIKI KAISHA ,  OLYMPUS OPTICAL CO., LTD. ,  SANYO ELECTRIC Co., Ltd. ,  FUJITSU LIMITED ,  HITACHI MAXELL, LTD.

    发明人： Tanaka, Yasuhito ,  Kurebayashi, Masaaki ,  Maeda, Takeshi ,  Watanabe, Hitoshi ,  Watanabe, Tetsu ,  Maeda, Shigemi ,  Sumi, Satoshi ,  Matsubayashi, Nobuhide ,  Matsuura, Michio

    IPC分类号： G11B11/10

    CPC分类号： G11B7/126 ,  G11B7/094 ,  G11B7/0941 ,  G11B7/0945 ,  G11B7/0956 ,  G11B11/10515 ,  G11B11/10576 ,  G11B11/10595

    摘要： A magneto-optical information recording/reproducing apparatus in which a magneto-optical information recording medium (1) at least including a first magnetic film having magneto-optical information recorded on a track and having perpendicular magnetic anisotropy, and a second magnetic film to which the magneto-optical information recorded on the first magnetic film is transferred by irradiation of a laser beam, is used so that a readout laser beam is irradiated onto the second magnetic film to thereby readout the magneto-optical information transferred to the second magnetic film. The apparatus includes a 2-split detection circuit (18) constituted by two detection elements (18a, 18b) for receiving the readout laser beam reflected from the second magnetic film of the magneto-optical information recording medium, and a subtraction circuit (19) in which output signals of the two detection elements of the 2-split detection circuit having levels corresponding to the quantities of light received by the two detection elements respectively are subtracted from each other to generate a differential signal expressing the difference between the output signals. The apparatus further comprises a circuit (22, 23) for making a spot of the laser beam jump one track before readout of the magneto-optical information from the magneto-optical information recording medium, a positive/negative balance correction circuit (20) for detecting an amplitude ratio between positive and negative side amplitudes in a track jump signal generated in the differential signal from the subtraction circuit in response to the track jump to thereby output a correction signal in accordance with the amplitude ratio, and an addition circuit (21) for adding the correction signal to the differential signal to thereby generate a tracking error signal for tracking control used in readout of the magneto-optical information from the magneto-optical information recording medium.

    Optical information recording/reproducing apparatus
    5.
    发明公开
    Optical information recording/reproducing apparatus 失效
    光信息记录/再现设备

    公开(公告)号：EP0309200A3

    公开(公告)日：1990-04-11

    申请号：EP88308708.2

    申请日：1988-09-20

    申请人： Hitachi Maxell Ltd.

    发明人： Sakemoto, Akito ,  Kanazawa, Yasunori ,  Watanabe, Hitoshi

    IPC分类号： G11B11/10 ,  G11B7/013 ,  G11B7/125 ,  G11B7/13

    CPC分类号： G11B11/10506 ,  G11B11/10515 ,  G11B11/10576 ,  G11B27/36

    摘要： An optical information recording/reproducing apparatus comprises signal recording means (7; 11) for recording a signal on a recording film of a recording medium (1) by rising temperature of the recording film through illumination with a writing laser beam (7), signal reproducing means (14, 8, 2, 3, 9, 10, 15, 16) for reproducing the signal by illuminating with a reading laser beam (8) the recording film of the record­ing medium (1) in which the signal is recorded, an optical system (12, 6, 4, 3, 2) provided in common to both the writing laser beam and the reading laser beam. The signal recorded on the recording film is reproduced substantially simultaneously with the recording of the signal for allowing confirmation of the signal having been recorded. A modulating circuit (20) is provided for modulating intensity of the writing laser beam (7) with a frequency at least twice as high as the maximum frequency of the signal to be recorded.

    Optical head with a double-beam splitter
    9.
    发明公开
    Optical head with a double-beam splitter 失效
    Optischer Kopf mit doppeltem Strahlteiler。

    公开(公告)号：EP0439876A1

    公开(公告)日：1991-08-07

    申请号：EP90300896.9

    申请日：1990-01-29

    申请人： Hitachi Maxell Ltd.

    发明人： Watanabe, Hitoshi ,  Sugiyama, Toshinori

    IPC分类号： G11B7/09 ,  G11B7/135 ,  G11B11/10

    CPC分类号： G11B11/10543 ,  G11B7/0912 ,  G11B7/1356

    摘要： An optical recording medium driving apparatus is disclosed which comprises a light source (1), an objective lens (6) for focusing light onto a reflecting surface (11a) of the recording medium, a beam splitter (41) for separating reflective convergent beam, and detectors (9, 10) for detecting separated beams of the reflective convergent beam flux. Two beam separation surfaces (41a,41b) are formed in the beam splitter and are located on an optical path extending from the light source to the objective lens. The two detectors are arranged corresponding to the respective beam separation surfaces of the beam splitter. The two detector are disposed so that one of the two separated beams of the reflective convergent beam flux is focused before one of the detectors and the other of the two separated beams is focused after the other of the detectors.

    摘要翻译： 公开了一种光记录介质驱动装置，其包括光源（1），用于将光聚焦到记录介质的反射表面（11a）上的物镜（6），用于分离反射会聚光束的分束器（41） 以及用于检测反射会聚光束的分离光束的检测器（9,10）。 两个光束分离表面（41a，41b）形成在分束器中，并且位于从光源延伸到物镜的光路上。 两个检测器被布置成对应于分束器的各个光束分离表面。 两个检测器被布置成使得反射会聚光束的两个分离的光束中的一个被聚焦在一个检测器之前，并且两个分离的光束中的另一个被聚焦在另一个检测器之后。